Pulp washer



Patented June 8, 1926i `UMTED STATES? PATENT voral-c'E..

KARL KIEFER, on CINCINNATI, oIIIo.

l PULP WASHER.

Application filed May 8, 1923. Serial No. 637,541,

ation by power. A further objectv is to pro-l vide for the readydrainage of the impuri-l ties and sediment separated from thepulp in theoperation of the machine, without loss of the pulp. A` further object isto retain the pulp and at the same time prevent clog ging of thedrainage means by the pulp thus retained. Other objects will appear inthe course of the ensuing description.

I accomplish these objects by the device illustrated, for example, inthe accompanying drawing, in which- Figure 1 is a general perspectiveview of the device; and

Fig 2 is a partial vertical cross section on the plane of the line 2-2of Fig. 1.

The tank 1 rests on a suitable support 2 having an extension supportingthe motor 3 with its shaft extending toward the tank 1 and carrying aworm 4t meshing with a worm wheel 5 which, together with the motor shaftand worm, is journaled in a housing 6 on the support 2 next to thetank 1. On an extension of the worm wheel shaft, which is transverse tothe tank 1, is a pulley 7 with a belt 8 passing around it. Arranged atintervals around the tank 1 near its circular upper rim, are brackets 9in which are vertical studs on which rotate rollers 10 having groovedperipheries; and a rotor 11 is made of an angle bar bent into a ringwith one leg of the angle at the bottom, projecting outwardly intogrooves of the rollers 10. The belt 8 passes around the vertical part ofthe rotor 11, over idler sheaves 12 journaled in inclined brackets 13 onthe side of the tank 1, which change its direction and keep it tight.

The rotor 11, thus Arotated by the motor 3, has fixed on its innerupright surface at diametrically opposite locations the two yokes 14rdepending from the rotor and carrying Scrapers 15 trunnioned therein onvertical axes and having their edges, which may be of rubber or thelike, passing against the screen 16, which is spaced inward from theWall of the tank all around having its top and bottom edges,respectively, attached to annular flanges 16 and16 (Fig. 2) ex-v tendingin from the wall of the tank, forming an annular conduit 17.v The outiowthrough the screen 16 is conducted by the conduit 17 to the outlet head18 opening o'ut through the tank wallfrom the conduit 17 at one side andhaving avdrainy pipe 19 leading down from its bottom to any suitabledrainage disposing means, noty shown. j

To cause `circulation in the tank and agitate the contents thereof, themotor shaft is extended through the wall of the tank 1, with a suitablestuffing box 20 around the shaft, and just inside the tank this shaftcarries a screw-bladed impeller 21, which drives the intermingled waterand pulp forward and against'the tank walls to be deflected therebyupward and outward to the,

screened outlet at the top, as indicated by the arrows in Fig. 1. y

At the side of the tank 1 remote from the impeller 1 is a spout 22closed by-a suit able gate, for withdrawing the cleaned pulp.

In use, the tank is filled with water, and the pulp to be cleaned isplaced therein and agitated, While a supply of fresh water is kept us asthe water flows out through the screen 16 with the impurities washedfrom the pulp. The Scrapers 15 not only keep the screen 16 from beingclogge'd by the pulp fibers, but exert a rubbing action on the pulpagainst the screen, assisting in the thorough separation of theimpurities from the pulp. As the effect of the agitation by the yokes,in conjunction with'the impeller, is centrifugal, there is a constantoutiow of bers lto the screen as fast as 'those are scraped awaytherefrom. As the operation,

including clearing the screened outlet, isautomatic, the operation maybe kept upy for an ample time to insure thorough cleansing of the pulp,without much attention from the operatives.

Modifications may occur, and I do not wish to be understood asfbeinglimited to the precise details herein shown and described, but what Iclaim as newr and desire to secure by Letters Patent is:

1. Ina pulp washer, a tank having an open top and a screened outlet atits side,

mechanism positioned away from the center of the tank and passingagainst the screen of said outlet, an impeller inside said tank,

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and having Ioperating means extending through the 'Wallet the tank;andan' oper-"" ative connection tronisaid imp'eller to said mechanism,outside said tank.

2. In a pulp Washer, a. tanlnhaving an open top and a screened outlet atits side, and mechanisin positioned away from 'the center of the tankand a scraper driven by said mechanism and passingagainst thescreenofsaid outlet. I l

3. YIn ajpulp' Wasi-ier,"Y aftank havingan open! top 'and an annularscreened'goutlet away' from t'hie center ofthe tank, and: Einech'- A'anisnicoinprising a rotatahle'ring extending aro'n'd'saidl outlet and ascraper ','carri'edn aroundtffwith saidring'and passing against the'screen "of said yoiitlet.` A

t. In a pulp IW'asl p tankluzwing an upper y annular ls'e'refeh'edoutlet, andy Inehai nismconiprising aring near saidoi'itlet'a'nd ascraper on said'iing pressing againstf'the screen of said outlet, androllers on said tank supporting said ring for rotation.

5. In apulpWasher, "a tank `haVinga-n upper screened outlet, andinechalnisin i cornprising al ring rotatably supported on said vtanknear said outlet and a scraper on said ring pressing against the screenof said outlet, 'a'nd a belt passing around said ring for rotationthereof.

6. In ap`ulp"Washer, a tank having an upper annular screened outlet,motive means L"near Athe botto'in of said tank, a ring rotat-."ableifne'ansaid outlet, a scraper 'carried'by saidri'ng pressingagainst the screen of said E'fout-let," rollers"v on said tanksupport-ing 's'aid' f ring, y"aiv belt vpassing aroundsaid ringand'I.Operatiiiel'y related-Ito said "in'oti've ineans,"

andg sheavesx on the side of said tankaround Whiclt'said 1belt'giasseesfronti said ring to l"said Emotive l'ndeansjt 1' f" KARLfiniainaa;1

